Network, supplier and CUI
The distribution operator manages the physical network; the supplier manages the commercial contract. The CUI identifies the installation.
When inspection may be required
First supply, a new installation or significant installation/appliance changes can require an authorised EIG inspection. Confirm the actual trigger with the operator and inspector.
Contract and safe activation
Identity, NIF, occupancy evidence, CUI and payment information may be requested. Never remove seals or manipulate a closed valve.
Butane and propane cylinders
Where mains gas is absent, bottled gas may be used. Follow the cylinder manufacturer’s location, ventilation, regulator and hose requirements; do not generalise one fuel rule to every building.
If you smell gas
- Do not use flames or electrical switches
- Close the valve and ventilate only if safe
- Leave the building
- Call 112 and the network emergency line from outside
Gas type, safety and contract preparation
Identify the system first
Natural gas, a building or local LPG installation and bottled gas are not the same contract. Identify the system before applying; do not assume that the CUI used for natural gas applies to every gas arrangement. Ask how the boiler and hot water are powered when viewing a home. Missing hot water can be a contract, appliance or installation problem; changing suppliers alone will not solve every case.
Questions before activation
Prepare the installation identifier, meter information, evidence of occupancy and opening reading. Ask the provider to distinguish a change of customer at an existing supply from a new connection or reopening. If an inspection is required, establish the accepted certificate, qualified issuer and appointment arrangements. Do not apply a single fee or waiting time from online comments to every property.
Billing and moving out
The meter reading in cubic metres and billed energy can use different units; first check dates and the meter number. If estimated usage accumulates, submit an actual reading through the operator’s current channel and keep confirmation. Request a closing date, reading and final account when leaving. If you smell gas or an appliance behaves abnormally, do not repeatedly restart it; contact the relevant emergency or fault service from a safe place. Use 112 for immediate danger and a qualified professional for installation work.
- Do you know the gas type and appliance energy source?
- Does the CUI match this installation?
- Are inspection and opening conditions documented?
- Have you saved readings, dates and the final account?
Official reference · Checked 6 October 2026.